Pressure and temperature sensor

Abstract

The utility model relates to the technical field of sensors, in particular to a pressure and temperature sensor which comprises a base, a conducting piece and a temperature sensing unit, a sealing groove is formed in the first end of the base, the conducting piece is arranged in the base in an insert injection molding mode, and the temperature sensing unit is arranged in the sealing groove. One end of the conduction piece extends out of the sealing groove of the base and is electrically connected with the temperature sensing unit, the sealing groove is filled with sealant, and the joint of the conduction piece and the base is completely sealed in the sealing groove; the sealing structure has the advantages of high sealing reliability, low requirement on glue, flexible production process, low manufacturing cost and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a pressure and temperature sensor. Background Art

[0002] Pressure and temperature sensors are used to monitor the pressure and temperature of the medium to realize vehicle status detection and performance control. The application scenarios of pressure and temperature sensors include air conditioning thermal management systems, transmission oil, hydrogen fuel cells, etc. The pressure of the measured medium is generally 3bar-35bar.

[0003] Among them, the temperature sensing unit of the pressure and temperature sensor is used to extend into the measured medium to detect the medium temperature. The pins of the thermistor are welded on the conductive part made of metal, and the conductive part is injection molded in the base made of plastic material. Since there is a gap between the plastic and metal materials, especially when the temperature difference changes greatly, the thermal expansion coefficients of the two materials are different, the gap will be magnified, and a leakage channel will be formed at the gap, affecting the overall sealing of the pressure and temperature sensor, causing the performance of the pressure and temperature sensor to fail, making the pressure and temperature sensor unable to be used normally, and there are many problems. Utility Model Content

[0004] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a pressure and temperature sensor, which has the advantages of high reliability of sealing structure, low glue requirement, flexible production process and low manufacturing cost.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a pressure and temperature sensor, including a base, a conductive member and a temperature sensing unit, wherein a sealing groove is formed at the first end of the base, the conductive member is arranged in the base by insert injection molding, and one end extends out from the sealing groove of the base to be electrically connected to the temperature sensing unit, the sealing groove is filled with sealant, and the junction between the conductive member and the base is completely enclosed in the sealing groove.

[0006] In one embodiment of the utility model, the pressure and temperature sensor further includes a pressure sensing unit, and a second end of the base opposite to the first end is provided with a receiving cavity, and the pressure sensing unit is received in the receiving cavity;

[0007] The base is provided with a flow channel penetrating the first end and the accommodating cavity, and the flow channel is located outside the sealing groove.

[0008] In one embodiment of the utility model, the end of the pressure sensing unit is adapted to be installed in the accommodating cavity, and between the pressure sensing unit and the base, one of them is provided with a snap-fit ​​hole, and the other is provided with a limiting protrusion adapted to the snap-fit ​​hole.

[0009] In an embodiment of the present utility model, the pressure and temperature sensor further includes a protective sleeve, and the protective sleeve is sleeved outside the temperature sensing unit.

[0010] In an embodiment of the present utility model, the pressure and temperature sensor further comprises a mounting seat, the mounting seat has a mounting cavity, and the base and the protective sleeve are mounted in the mounting cavity.

[0011] In an embodiment of the utility model, between the protective sleeve and the mounting seat, one of them is provided with a buckling groove, and the other is provided with an undercut structure adapted to the buckling groove.

[0012] In an embodiment of the utility model, a plurality of first notches are evenly arranged at one end of the protective sleeve close to the accommodating cavity, and the first notches cooperate with the flow channel to connect the protective sleeve and the accommodating cavity.

[0013] In an embodiment of the present invention, the undercut structure is integrally provided with the protective sleeve, and the undercut structure is formed between two adjacent first notches.

[0014] In one embodiment of the utility model, a first sealing ring is provided between the inner side of the base and the pressure sensing unit, and a second sealing ring is provided between the outer side of the base and the mounting seat;

[0015] One end of the flow channel facing the pressure sensing unit is located in the enclosed area of ​​the first sealing ring and the second sealing ring.

[0016] In an embodiment of the present invention, the temperature sensing unit is a thermistor, and the thermistor is electrically connected to the conductive member through a pin.

[0017] In summary, the periphery of the sealing groove of the utility model is in an open area, so that when dispensing glue on the sealing groove on the base, the dispensing operation is convenient, the dispensing quality is easy to be guaranteed, and the requirements for the dispensing equipment are low; after the dispensing is completed, the dispensing equipment can conveniently detect the dispensing state, effectively ensuring the dispensing quality; at the same time, it avoids the dispensing equipment from operating in a narrow hole, and the glue is easy to flow and fill the sealing groove, and the bottom of the sealing groove is sealed without leakage, thereby reducing the requirements for the performance of glue fluidity, etc., facilitating the selection of glue and reducing the cost of glue raw materials; at the same time, the production process is flexible, and the processes such as dispensing, welding, and protective sleeve assembly can be flexibly adjusted according to the production arrangement, and the process sequence or production site can be flexibly adjusted, thereby improving production efficiency and reducing manufacturing costs; in summary, the pressure and temperature sensor of this case has the advantages of high reliability of sealing structure, low requirements for glue, flexible production process and low manufacturing cost; BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of the pressure and temperature sensor of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of dispensing before the improvement of the utility model;

[0021] Figure 3 This is a schematic diagram of the overall structure of the pressure and temperature sensor before improvement of the utility model;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the base of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the dispensing of glue before welding the conductive part and the thermistor of the utility model;

[0024] Figure 6 It is a structural schematic diagram of the conductive part and the thermistor of the utility model after being welded and then glued;

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of the protective sleeve of the utility model;

[0026] Figure 8 It is a structural schematic diagram of the protective sleeve of the utility model being assembled on a mounting seat;

[0027] Explanation of component numbers: base 1, first end 11, sealing groove 12, sealant 121, accommodating cavity 13, flow channel 14, limiting protrusion 15, temperature sensing unit 2, thermistor 21, pin 22, conductive part 3, protective sleeve 4, undercut structure 41, first notch 42, second notch 43, hole 44, pressure sensing unit 5, sensing end 51, mounting seat 6, mounting cavity 60, assembly end 61, limiting end 62, first connecting section 63, first sealing ring 70, second sealing ring 71, third sealing ring 72, dispensing head 8. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0029] See also Figures 1 to 8 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0030] In order to solve the technical problem in the background technology and ensure the sealing of the gap between the conductive member 3 and the base 1, in an improvement before this solution, as Figure 2-3 As shown, the pin 22 of the thermistor 21 is first welded to the conductive member 3 on the base 1, and then the protective sleeve 4 is installed on the base 1. The glue dispensing head 8 of the glue dispensing device extends into the hole 44 of the protective sleeve 4 to dispense the sealant 121. The sealant 121 flows into the bottom of the protective sleeve 4 and covers the entire interface between the conductive member 3 and the base 1 to achieve the sealing of the conductive member 3. The assembly after glue dispensing is then installed with a sealing ring, and the protective sleeve 4 passes through the circular hole of the mounting seat 6 to assemble into a complete pressure and temperature sensor. However, the above solution has the following shortcomings:

[0031] First, the sealing reliability is poor: the glue dispensing head 8 extends into the protective sleeve 4 through the hole 44 of the protective sleeve 4 to dispense glue. The space is small and the glue dispensing equipment is difficult to operate, which may easily cause poor glue dispensing. In addition, the glue state at the bottom after dispensing is difficult to detect by observation, and there is a risk of sealing reliability. Second, the glue cost is high: the glue dispensing flows into the bottom of the protective sleeve 4 through the hole 44 of the protective sleeve 4, and the fluidity of the glue and the matching accuracy of the sealing surface are high. If the fluidity of the glue is poor, it is difficult to cover the sealing surface. If the fluidity of the glue is good, it is easy to seep out along the gap at the bottom. The glue selection range is narrow and the cost is high. Third, the process flexibility is poor: the scheme requires the process to be executed according to a fixed procedure, that is, first weld the pin 22 of the thermistor 21 and the conductive part 3, then install the protective sleeve 4 and dispense glue in turn, and finally assemble the mounting seat 6, so that the process sequence cannot be adjusted, affecting the investment and planning of the production line.

[0032] See also Figure 1 , 4 Based on the defects of the above schemes, the utility model provides a pressure and temperature sensor, including a base 1, a conductive member 3 and a temperature sensing unit 2, wherein a sealing groove 12 is formed at a first end 11 of the base 1, the conductive member 3 is arranged in the base 1 by insert injection molding, and one end of the conductive member 3 extends out from the sealing groove 12 of the base 1 to be electrically connected to the temperature sensing unit 2, the sealing groove 12 is filled with a sealant 121, and the sealant 121 is used to completely seal the junction between the conductive member 3 and the base 1 in the sealing groove 12.

[0033] It should be noted that the sealing groove 12 formed at the first end 11 of the base 1 is open, the base 1 is generally made of plastic material, and the partial structural section of the conductive member 3 is integrally injection molded, integrally hot-pressed, or integrally extruded with the base 1; the temperature sensing unit 2 is a thermocouple, a platinum resistor, or a thermistor 21, or other sensing units that meet the use requirements; the conductive member 3 is a conductor, and the material is metal copper, iron, or aluminum, etc. that meets the use requirements. The sealant 121 can be one of silicone rubber sealant 121, epoxy resin sealant 121, polyurethane sealant 121, acrylic sealant 121, or other sealants 121 that meet the use requirements.

[0034] See also Figure 1 , 4Compared with the previous improvement, the periphery of the sealing groove 12 in this case is in an open area, which is convenient for glue dispensing operation, the glue dispensing quality is easy to be guaranteed, and the requirements for glue dispensing equipment are low; specifically, after the glue dispensing is completed, the glue dispensing equipment can conveniently detect the glue dispensing state, effectively ensuring the glue dispensing quality; the glue dispensing equipment avoids operating in a narrow hole 44, and the glue is easy to flow and fill the sealing groove 12, and the bottom of the sealing groove 12 is sealed without leakage, thereby reducing the requirements for the performance of glue fluidity, etc., facilitating the selection of glue, and reducing the cost of glue raw materials; at the same time, the production process is flexible, such as Figure 1 , 5 As shown in , 6, and 8, the processes of dispensing, welding, and assembly of the protective sleeve 4 can be flexibly adjusted according to the production arrangement, and the process sequence or production site can be flexibly adjusted, thereby improving production efficiency and reducing manufacturing costs. Compared with the previously improved pressure and temperature sensor, the pressure and temperature sensor in this case has the advantages of high reliability of the sealing structure, low glue requirements, and flexible production process.

[0035] Furthermore, the medium is gas or liquid.

[0036] See also Figure 1 , 5 In one embodiment of the utility model, the pressure temperature sensor further includes a pressure sensing unit 5, and a second end of the base 1 opposite to the first end 11 is provided with a receiving cavity 13, and the pressure sensing unit 5 is received in the receiving cavity 13;

[0037] The base 1 is provided with a flow channel 14 penetrating the first end 11 and the accommodating cavity 13 , and the flow channel 14 is located outside the sealing groove 12 .

[0038] It should be noted that the pressure sensing unit 5 is a sensing element on a strain gauge pressure and temperature sensor, a capacitive pressure and temperature sensor, a piezoelectric pressure and temperature sensor, or a diaphragm pressure and temperature sensor, and the sensing end 51 of the pressure sensing unit 5 is arranged toward the flow channel 14. The second end is the other end of the base 1 away from the first end 11, and the pressure sensing unit 5 can be at least partially accommodated in the installation cavity 13. It should be understood that when the installation cavity 13 is large enough, it can also accommodate the entire pressure sensing unit 5; the flow channel 14 runs through the outside of the sealing groove 12 of the first end 11 of the base 1 and is connected to the accommodating cavity 13. The flow channel 14 is used to transmit the medium pressure at the protective sleeve 4 to the pressure sensing unit 5, so as to facilitate the pressure sensing unit 5 to detect the pressure of the medium.

[0039] See also Figure 4Furthermore, the cross-section of the sealing groove 12 is a non-circular cross-section, and the outer wall of the sealing groove 12 is adapted to be installed with the inner wall of one end of the protective sleeve 4; further, the sealing groove 12 is annular, and the flow channel 14 is arranged at the annular portion outside the sealing groove 12, so as to facilitate the medium entering from the protective sleeve 4 to be introduced into the sensing end 51 of the pressure sensing unit 5 through the flow channel 14.

[0040] See also Figure 5 In one embodiment of the utility model, the end of the pressure sensing unit 5 is adapted to be installed in the accommodating cavity 13, and between the pressure sensing unit 5 and the base 1, one of them is provided with a snap-fit ​​hole, and the other is provided with a limiting protrusion 15 adapted to the snap-fit ​​hole.

[0041] It should be noted that when the snap-fit ​​hole is set on the pressure sensing unit 5, the limiting protrusion 15 is set on the base 1. Through the coordinated setting of the snap-fit ​​hole and the limiting protrusion 15, the assembly between the pressure sensing unit 5 and the base 1 can be made simpler and more efficient. In addition, the coordination of the snap-fit ​​hole and the limiting protrusion 15 makes the maintenance and replacement of the pressure and temperature sensor more convenient and quick, saving the time and cost of maintenance work. It should be understood that the base 1 and the pressure sensing unit 5 can also be fastened by fasteners or fixed by bonding.

[0042] See also Figure 5 Furthermore, the limiting structure 15 is a snap-fit ​​structure or a snap-fit ​​hole. By setting the limiting structure 15 as a snap-fit ​​structure or a snap-fit ​​hole, it is convenient to quickly install the assembly end 61 of the mounting seat 6 with the pressure sensing unit 5 or other equipment, such as a lock-fit, elastic snap-fit ​​or embedded snap-fit ​​structure.

[0043] See also Figure 1 , 7 -8. In an embodiment of the present utility model, the pressure and temperature sensor further comprises a protective sleeve 4 , and the protective sleeve 4 is sleeved outside the temperature sensing unit 2 .

[0044] It should be noted that the protective sleeve 4 is generally made of plastic material; one end of the protective sleeve 4 is installed on the base 1, and the other end of the protective sleeve 4 is a free end. The medium is introduced by the protective sleeve 4, and the axial direction of the protective sleeve 4 is perpendicular to the plane where the base 1 is located, and the protective sleeve 4 can at least cover the temperature sensing unit 2 in its own axial direction, so as to avoid the temperature sensing unit 2 being directly in the medium with high speed and high pressure flow, thereby reducing the swing amplitude of the connection between the temperature sensing unit 2 and the base 1 or the mounting seat 6, and then avoiding the risk of the welding point between the temperature sensing unit 2 and the base 1 swinging and breaking, thereby extending the service life of the pressure temperature sensor; at the same time, the protective sleeve 4 can reduce the influence of the medium with high speed and high pressure flow on the stability of the temperature sensing unit 2 acquiring the signal, thereby improving the working performance of the pressure temperature sensor.

[0045] In an embodiment of the present utility model, the pressure and temperature sensor further comprises a mounting seat 6 , wherein the mounting seat 6 has a mounting cavity 60 , and the base 1 and the protective sleeve 4 are mounted in the mounting cavity 60 .

[0046] It should be noted that, by providing the mounting seat 6 , the base 1 and the protective sleeve 4 can be assembled together, and the base 1 can also be protected.

[0047] See also Figure 1 , 8 In one embodiment of the utility model, the mounting base 6 includes an assembly end 61 and a limiting end 62; the protective sleeve 4 and the base 1 are installed in the mounting base 6 through the assembly end 61, the limiting end 62 is used to connect to the device to be tested, and at least part of the structure of the temperature sensing unit 2 is exposed at the limiting end 62.

[0048] It should be noted that the assembly end 61 is the large end of the mounting seat 6, which is open to facilitate the installation of the protective sleeve 4 and the base 1, while the limiting end 62 is the small end, which is used to prevent the protective sleeve 4 and the base 1 installed in the mounting seat 6 from completely passing through this end. The mounting seat 6 can be set to a ring shape or other shapes that meet the use requirements; the limiting end 62 is used to connect with the device to be tested, so that the temperature sensing unit 2 is exposed at the limiting end 62, so that the temperature sensing unit 2 can be extended into the device to be tested for temperature detection, so as to improve the accuracy and precision of temperature detection, and avoid the problem of inaccurate temperature detection due to the temperature difference between the inside and outside of the device to be tested. It should be understood that the limiting end 62 can also be connected to the device to be tested through a pipeline, which is within the protection scope of this case. Of course, if the temperature of the medium in the pipeline is reduced or increased, insulation measures can be taken for the pipeline to reduce temperature fluctuations.

[0049] See also Figure 1 , 8As an optional embodiment of the utility model, the interior between the assembly end 61 and the limiting end 62 of the mounting seat 6 is the mounting cavity 60 of the mounting seat 6, and the flow channel 14 is located in the enclosed area of ​​the mounting cavity 60, so that the mounting seat 6 becomes the outer wall forming the connection between the base 1 and the protective sleeve 4, ensuring that the protective sleeve 4 is connected to the flow channel 14 of the base 1 without leakage, thereby ensuring the accuracy of pressure detection of the pressure temperature sensor.

[0050] See also Figure 1 , 7 -8. In one embodiment of the present invention, between the protective sleeve 4 and the mounting seat 6, one of them is provided with a snap-fitting groove, and the other is provided with an undercut structure 41 adapted to the snap-fitting groove.

[0051] It should be noted that the protective sleeve 4 and the mounting seat 6 are adapted for installation, and the protective sleeve 4 can be connected to the inner wall of the mounting seat 6 or the outer wall of the mounting seat 6; the buckle hole or undercut structure 41 on the protective sleeve 4 can be set in the middle of the outer wall of the protective sleeve 4 or at the end of the protective sleeve 4, and can be set according to actual needs, as long as it can be connected to the inner wall of the mounting seat 6 by snapping. Through the coordinated setting of the buckle groove and the undercut structure 41, the protective sleeve 4 can be stably installed to prevent the protective sleeve 4 from falling, and no screws are required, so the assembly is simple, convenient and efficient.

[0052] In an embodiment of the utility model, a plurality of first notches 42 are evenly arranged at one end of the protective sleeve 4 close to the accommodating cavity 13 , and the first notches 42 cooperate with the flow channel 14 to connect the protective sleeve 4 with the accommodating cavity 13 .

[0053] It should be noted that the first notch 42 is used to transmit the medium pressure to the pressure sensing unit 5. The shape of the first notch 42 is not limited as long as it can meet the use requirements. By setting a plurality of first notches 42, the medium in the protective sleeve 4 can transmit the medium pressure to the pressure sensing unit 5 more quickly and fully through the flow channel 14, thereby improving the response speed of the pressure and temperature sensor.

[0054] See also Figure 1 , 6 7. As an optional embodiment of the present utility model, a plurality of second notches 43 or through holes are evenly arranged at one end of the protective sleeve 4, and the second notches 43 or through holes are adjacent to the temperature sensing unit 2.

[0055] It should be noted that the second notch 43 or through hole can be arranged flush with the temperature sensing unit 2, and multiple second notches 43 or through holes are evenly arranged on the axial surface of the protective sleeve 4, so that the temperature sensing unit 2 can be fully in contact with the measured medium, thereby improving the temperature detection response speed of the temperature sensing unit 2.

[0056] See also Figure 1 , 6 7. In an embodiment of the present invention, the undercut structure 41 is integrally provided with the protective sleeve 4 , and the undercut structure 41 is formed between two adjacent first notches 42 .

[0057] It should be noted that the undercut structure 41 and the first notch 42 are complementary in structure and can be integrated into one. The first notch 42 can be formed when the undercut structure 41 is injection molded, thereby avoiding the problem of time-consuming, labor-intensive and high processing cost of opening the first notch 42 separately. Therefore, this structural design has high practical value.

[0058] See also Figure 1 In one embodiment of the utility model, a first sealing ring 70 for sealing is provided between the inner side of the base 1 and the pressure sensing unit 5, and a second sealing ring 71 for sealing is provided between the outer side of the base 1 and the mounting seat 6;

[0059] One end of the flow channel 14 facing the pressure sensing unit 5 is located in the enclosed area of ​​the first sealing ring 70 and the second sealing ring 71 .

[0060] It should be noted that, by cooperating with the first sealing ring 70 and the second sealing ring 71 , the sealing of the passage from the protective sleeve 4 to the pressure sensing unit 5 can be ensured to avoid leakage, thereby improving the accuracy of pressure detection.

[0061] See also Figure 1 , 8 As an optional embodiment of the present utility model, a first connecting section 63 is provided on the axial surface of the mounting seat 6 close to the limiting end 62, and the first connecting section 63 is used for matching and connecting with the device to be tested;

[0062] A third sealing ring 72 is sleeved on the first connecting section 63 , and the third sealing ring 72 is used to seal the mounting seat 6 and the device under test.

[0063] It should be noted that the first connecting section 63 is a threaded connecting section, and the mounting seat 6 is threadedly connected to the device to be tested through the threaded connecting section, and the threaded connection provides good sealing performance, which can prevent medium leakage to a certain extent, improve the sealing of the connection, and cooperate with the second sealing ring 71 to further improve the sealing and prevent leakage, thereby improving the accuracy of the pressure sensing unit 5 in sensing the medium pressure. At the same time, the threaded connection design enables the pressure and temperature sensor to be easily and quickly installed on the device to be tested, and is easy to disassemble, and the threaded interface occupies a small space, has a compact structure, and has a high mechanical connection strength.

[0064] See also Figure 8 An annular groove is provided on the axial surface of the mounting seat 6 near the limiting end 62, and the third sealing ring 72 is provided in the annular groove, and the third sealing ring 72 is limited by the annular groove; through the setting of the third sealing ring 72, the leakage of the medium at the connection between the mounting seat 6 and the device to be tested can be avoided or reduced, thereby ensuring the smooth progress of pressure detection and / or temperature detection and the safety of the detection process.

[0065] See also Figure 1 , 6 As an optional embodiment of the present invention, the temperature sensing unit 2 is a thermistor 21 , and the thermistor 21 is electrically connected to the conductive member 3 via a pin 22 .

[0066] It should be noted that the temperature sensing unit 2 represents a temperature-pressure-temperature sensor or a sensing element of a temperature-pressure-temperature sensor. The sensing element of the temperature sensing unit 2 is a thermistor 21, and further a negative temperature coefficient thermistor 21. As the temperature increases, the resistance value of the thermistor 21 decreases, and the thermistor is suitable as a sensing element of a temperature-pressure-temperature sensor. The thermistor 21 is arranged along the axial direction of the protective sleeve 4, and the thermistor 21 is welded to the conductive member 3 through a pin 22. The pin 22 is generally encapsulated by an insulating material, such as an insulating plastic or ceramic shell or a heat shrink tube or an insulating protective sleeve 4. The welding point between the pin 22 and the conductive member 3 can be either inside the sealing groove 12 or outside the sealing groove 12, and can be selected according to the actual process sequence.

[0067] Furthermore, the limiting end 62 of the mounting seat 6 is used to connect with the device to be tested, which mainly refers to the medium system or equipment that needs to monitor its pressure and temperature, such as liquid pipelines, gas pipelines, storage tanks, automobile engines, aircraft engines, turbines, water pumps, compressors, regulating valves, boilers, heat exchangers, cooling towers, etc.; and the pressure sensing unit 5 and the conductive part 3 can be connected to external equipment, which mainly refers to equipment used to receive, process and display the output of pressure and temperature sensors, such as automatic control systems, monitoring systems, etc., for real-time monitoring and control of the pressure and temperature of the medium system; a computer or data recorder for recording, analyzing and storing the output data of the pressure and temperature sensor, a display or indicator for displaying the pressure and temperature values ​​or graphs output by the pressure and temperature sensor, and an alarm or alarm device for issuing an alarm signal when the set range is exceeded.

[0068] Further, the temperature sensing unit 2 is a thermocouple or platinum resistor or thermistor 21 or other sensing units that meet the use requirements. The thermocouple is a thermocouple node formed by welding two different metal (or alloy) wires at one point. The main principle is based on the Seebeck effect, that is, the temperature difference between the two different conductors will generate an electromotive force. The platinum resistor is usually a coil formed by winding pure platinum. Based on the characteristic that the resistivity of the metal changes with temperature, the resistance of the metal usually increases when the temperature rises. The thermistor 21 is a resistor made of oxide semiconductor material, and its resistance changes significantly with temperature.

[0069] Furthermore, the pressure sensing unit 5 is a sensing element on a strain gauge pressure and temperature sensor, a capacitive pressure and temperature sensor, a piezoelectric pressure and temperature sensor, or a diaphragm pressure and temperature sensor. The strain gauge pressure and temperature sensor detects pressure by measuring the tiny deformation of the material surface caused by force. The capacitive pressure and temperature sensor detects pressure by measuring the change in the distance between two conductive plates (plates of a capacitor), and the change in this distance will cause a change in capacitance. The piezoelectric pressure and temperature sensor utilizes the property that some materials will generate electric charge when subjected to pressure. The diaphragm pressure and temperature sensor includes a bendable diaphragm, and changes in pressure will cause the diaphragm to move, and this displacement can be converted into an electrical signal.

[0070] See also Figure 1 , 5-8, the process steps of the pressure temperature sensor production process are: the first step, apply sealant 121 to the sealing groove 12 of the base 1, the second step, weld the pin 22 of the thermistor 21 to the conductive part 3, the third step, install the first sealing ring 70 and assemble the pressure sensing unit 5 on the base 1, the fourth step, install the second sealing ring 71 and assemble the mounting base 6 and the protective sleeve 4 on the base 1, and the fifth step, install the third sealing ring 72 to complete the assembly. The above steps can be flexibly adjusted according to actual arrangements, such as swapping the first and second steps, and the production process can be flexibly arranged in different sites or production units.

[0071] In summary, the utility model effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.

[0072] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A pressure and temperature sensor, characterized in that: It includes a base, a conductive part and a temperature sensing unit. A sealing groove is formed at the first end of the base. The conductive part is arranged in the base by insert injection molding, and one end extends out from the sealing groove of the base to be electrically connected to the temperature sensing unit. The sealing groove is filled with sealant to completely seal the junction between the conductive part and the base in the sealing groove.

2. The pressure and temperature sensor according to claim 1, characterized in that: It also includes a pressure sensing unit, and a second end of the base opposite to the first end is provided with a receiving cavity, and the pressure sensing unit is received in the receiving cavity; The base is provided with a flow channel penetrating the first end and the accommodating cavity, and the flow channel is located outside the sealing groove.

3. The pressure and temperature sensor according to claim 2, characterized in that: The end of the pressure sensing unit is adapted to be installed in the accommodating cavity, and between the pressure sensing unit and the base, one of them is provided with a buckling hole, and the other is provided with a limiting protrusion adapted to the buckling hole.

4. The pressure and temperature sensor according to claim 2, characterized in that: It also includes a protective sleeve, which is sleeved outside the temperature sensing unit.

5. The pressure and temperature sensor according to claim 4, characterized in that: It also includes a mounting seat, which has a mounting cavity, and the base and the protective sleeve are installed in the mounting cavity.

6. The pressure and temperature sensor according to claim 5, characterized in that: Between the protective sleeve and the mounting seat, one of them is provided with a buckling groove, and the other is provided with an undercut structure adapted to the buckling groove.

7. The pressure and temperature sensor according to claim 6, characterized in that: A plurality of first notches are evenly arranged at one end of the protective sleeve close to the accommodating cavity, and the first notches cooperate with the flow channel to connect the protective sleeve and the accommodating cavity.

8. The pressure and temperature sensor according to claim 7, characterized in that: The undercut structure is integrally provided with the protective sleeve, and the undercut structure is formed between two adjacent first notches.

9. The pressure and temperature sensor according to claim 5, characterized in that: A first sealing ring is provided between the inner side of the base and the pressure sensing unit, and a second sealing ring is provided between the outer side of the base and the mounting seat; One end of the flow channel facing the pressure sensing unit is located in the enclosed area of ​​the first sealing ring and the second sealing ring.

10. The pressure and temperature sensor according to claim 1, characterized in that: The temperature sensing unit is a thermistor, and the thermistor is electrically connected to the conductive member through a pin.

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